Dyfyniad APA
Kotler, P., & Armstrong, G. (2006). Principles of marketing (11th.ed.). Prentice Hall.
Dyfyniad Arddull Chicago
Kotler, Philip, and Gary Armstrong. Principles of Marketing. 11th.ed. New Jersey: Prentice Hall, 2006.
Dyfyniad MLA
Kotler, Philip, and Gary Armstrong. Principles of Marketing. 11th.ed. Prentice Hall, 2006.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.